Cách sử dụng
The expression "drop in" means to visit someone or somewhere without making any prior arrangements or appointments. For example, if you're passing by a friend's house and decide to stop by for a quick chat, you can say "I'm just going to drop in to see my friend." Similarly, if there's a store or a place that you visit frequently, you can say "I often drop in to that store to buy groceries." Essentially, it means to show up unannounced without any fixed plans.